diff --git a/src/libFLAC/bitmath.c b/src/libFLAC/bitmath.c
index 5ace20b9..6b4912ea 100644
--- a/src/libFLAC/bitmath.c
+++ b/src/libFLAC/bitmath.c
@@ -54,7 +54,16 @@
  * ilog2(17) = 4
  * ilog2(18) = 4
  */
-unsigned FLAC__bitmath_ilog2(unsigned v)
+unsigned FLAC__bitmath_ilog2(FLAC__uint32 v)
+{
+	unsigned l = 0;
+	FLAC__ASSERT(v > 0);
+	while(v >>= 1)
+		l++;
+	return l;
+}
+
+unsigned FLAC__bitmath_ilog2_wide(FLAC__uint64 v)
 {
 	unsigned l = 0;
 	FLAC__ASSERT(v > 0);
diff --git a/src/libFLAC/include/private/bitmath.h b/src/libFLAC/include/private/bitmath.h
index ce4eeaa0..6e39ecce 100644
--- a/src/libFLAC/include/private/bitmath.h
+++ b/src/libFLAC/include/private/bitmath.h
@@ -34,7 +34,8 @@
 
 #include "FLAC/ordinals.h"
 
-unsigned FLAC__bitmath_ilog2(unsigned v);
+unsigned FLAC__bitmath_ilog2(FLAC__uint32 v);
+unsigned FLAC__bitmath_ilog2_wide(FLAC__uint64 v);
 unsigned FLAC__bitmath_silog2(int v);
 unsigned FLAC__bitmath_silog2_wide(FLAC__int64 v);